Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a28bfbb13ce5c2…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 18:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 529d851891c6d381d628a9cbb0ae8613 SHA-1: df8c7bc1bea2739b00d83ad11cb8794642443023 SHA-256: 82a28bfbb13ce5c252724857f5996e28daeec97e4597ed08c426d850c0b1f73d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggest a link farm designed to redirect users to malicious content or phishing sites. The file's structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pixomot.ru/uplcv?utm_term=best+double+tap+unlock+app+for+android PDF link annotation
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144602f1570e---99816852528.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/73949076824.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/balewofinowekiludeg.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/16317599594.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/93197880472.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/98c5945f8a77f0c9801fdfe93f93e46c/82808814629.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/99048930555.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/99264601433.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/15584529852.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/towunud.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/78090556295.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/66745673476.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b53a639990---sopemugarunezomorilito.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/6734102630.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/dibinitoxa.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e856bed63---95843705964.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/4508904975.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/44252170815.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pomikemitim.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/61e9766dc85389d83df8cecb3dfeabc6/94301021049.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/fasobexenujazo.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/10584822161.pdfIn PDF document text
    • https://b2cdemo.tickets.com/content/files/67392094435.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE046 17712 bytes
SHA-256: 9178d1ab936840fa76957a79df09e4acf538522a217e7656d7fdc6808eae18fb
font_01_sfnt_off00010e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E30 10996 bytes
SHA-256: 3b597dc9cc4f91c66f8451db10f13ef08c81260e5f5876d050da43eecc944eec
font_02_sfnt_off000127b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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